Merge pull request #23257 from Algorithm5838/perf/text-token-css-animation

perf: replace JS transition with CSS animation in TextToken

src/app.css

@@ -243,6 +243,19 @@ select {
 	animation: smoothFadeIn 0.2s forwards;
 }
 
+@keyframes fade-in-token {
+	from {
+		opacity: 0;
+	}
+	to {
+		opacity: 1;
+	}
+}
+
+.fade-in-token {
+	animation: fade-in-token 100ms ease-out;
+}
+
 .katex-mathml {
 	display: none;
 }